Metallic compound for projectiles.



NITED STATES PATENT OFFICE.

GEORGES ROTH AND CHARLES KRNKA, OF VIENNA, AUSTRIA-HUNGARY.

METALLIC COMPOUND FOR PROJECTILES.

SPECIFIGA'IION forming part of Letters Patent NO. 645,976, dated March27, 1906.

Application filed June 17, 1898. Serial No. 683,729- PecimensJ To allwhom it may concern;

} Be it known that we, GEORGES ROTH and CHARLES KRNKA, subjects of theEmperor'of Austria-Hungary, residing at Vienna, Empire ofAustria-Hungary, have invented a new and useful Improved MetallicCompound for Projectiles, of which the following is a full, clear, andexact description.

The object of the present invention is to render the steel, copper, ornickel mantles hitherto applied to lead or hard-lead bullets andprojectiles unnecessary. The core of this class of projectiles, as isknown, is made of comparatively-soft metallic alloys (lead and antimony)and inc'ased or partially incased in a harder shell.

According to the present invention a simpler form of projectile isproduced,which consists of a harder metallic compound.

The metallic alloys hitherto known, such as brass and all the copperalloys, will not serve the purpose in view, owing to the fact that thesemetalsrub 0E in the barrel of the weapon, being much too soft, so thatnot only is the precision of aim rendered less, but also the bulletflattens in the object struck. Particularly is this latter the case ifthe form of the projectile is complicated or peculiar, so that in suchcases the power of penetration is reduced. Even Delta metal, as also allother copper alloys containing iron or manganese, are unsuited for thepurpose. Then,- again, all the metal alloys hitherto known have thedisadvantage that their specific weight is insufficient and notsufficiently approximate to that of the hard-lead projectile with steelcasing.

The new alloy forming the object of th present invention consists of acopper-tungsten or nickel-tungsten compound or a copper alloy containingtungsten. The amount of tungsten contained in the compound may in allcases be in excess of fifty per cent. if the excessive hardness andbrittleness of such projectiles need not be taken into account. For allrequirements hitherto made twentyfive per cent. of tungsten with purecopper, nickel, or a copper alloy will be found perfectly suffioient. Ifthe copper-tungsten or nickel-tungsten compound contains twenty 56 percent. of tungsten, the specific weight of the projectile will be equalto that of the hard lead projectile with a steel casing.

The manner in which the present invention is carried out is briefly asfollows: The cop'- per or copper alloy-'advantageous1y an alloy ofcopper and nickelis placed, together with the desired percentage fifteento twenty five per cent.'of tungsten, in a crucible and subjected to theheat of ahydroexygen-gas flame 60 or to that of an electric furnace,being heated to the utmost extent. The castings obtained from the meltedproducts are then rolled and drawn or forged to the required shape forthe projectile. These projectiles are then finished by mechanical means,the material of the same having been rendered denser by the forging ordrawing process. The electric furnace gives suiflcient heat to properlyand efficaciously carry out the-process of forming 7c the alloy. If thealloy has not been properly formed, the tungsten will dust out orseparate out in the form of powder during the drawing or rollingprocess.

The amount of tungsten in the compound is varied according to thespecific weight required or according to the degree of hardness of theprojectile which it is desirable to attain.

One of the main advantages of the present new projectile material isthat the specific weight of the projectile may be determined at will, sothat specifically light or heavy projectiles may be manufactured,according to requirement.

We claim as our invention A mantleless projectile consisting of amalleable alloy of copper, nickel and at least ten per cent. oftungsten.

In witness whereof we have hereunto set 0 our hands in presence of twowitnesses.

GEORGES ROTH. CHARLES KRNKA.

Witnesses:

HENRY O. CARPENTER, OHAs. E. CARPENTER.

